C++ Programs Examples

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1. Program to Display Simple Message:-

#inlude<iostream.h>

void main()

{

cout<<"Welcome to my blog.\n";

cout<<"Thank you for visiting my blog.";

 }

/*************************Output**************************/

Welcome to my blog.

Thank you for visiting my blog.

2. Program to find addition of first 100 numbers:-

#include<iostream.h>

void main()

{

int sum=0,i;

for(i=1;i<100;i++)

{

sum=sum+i;

}

cout<<"Addition of first 100 numbers is:-"<<sum;

}

/*************************Output**************************/

Addition of first 100 numbers is:-5050

3. Program to compute sum of the series:1²+2²+3²+4²+....+n²

The value of n should be accepted from user.

^{#include<iostream.h>}

^{void main()}

^{

^{int n,a=1,b,sum=0;}

^{cout<<"Enter the limit n:-";}

^cin>>n;

^do

   ^{  

       ^b=a*a;

       ^sum+=b;

       ^a++;

    ^}

^while(a<=n);

^{cout<<"Sum of the series = "<<sum<<endl;
}}

/*************************Output**************************/

^{Enter the limit n:-5}

Sum of the series =55

^{4. Program to convert binary number to decimal number}

^{#include<iostream.h>
#include<math.h>
void main()
  {
  int a[10],i,no,j,r=0;
  double sum=0;
  cout<<"Enter Binary Number:-";
  cin>>no;
  i=0;
  while(no>0)
     {
         a[i]=no%10;
         no=no/10;
         i++;
     }
  for(j=0;j<i;j++)
    {
      sum=sum+a[j]*pow(2,r);
      r++;
     }
  cout<<"Decimal Number Is:"<<sum<<endl;
  }}

/*************************Output**************************/

Enter Binary Number:-111

Decimal Number Is:-7

5.Program to calculate factorial using recursion function:-

int factorial(int n);

#include<iostream.h>

void main()

{

int n,f;

cout<<"Enter the number of which factorial is to be find:-";

cin>>n;

f=factorial(n);

cout<<"Factorial is :-"<<f;

}

 int factorial(int n)

  {

      int fact=1;

      if(n==1)

          {

                  return1;

           }

          else

           {

              fact=factorial(n-1)*n;

              return(fact);

            }

}

/*************************Output**************************/

Enter the number of which factorial is to be found:-3

Factorial is :-6

6.Program to print the square root of given numbers using standard (built-in ) library function:-

#include<iostream.h>

#include<math.h>

void main()

{

 double n;

 cout<<"Enter a positive number:-";

 cin>>n;

  while(n>0)

   {

    cout<<"Square root of"<<n<<"is:-"<<sqrt(n)<<endl;

   cout<<"Enter the next number or enter 0 to quit:-";

   cin>>n;

  }

}

/*************************Output**************************/

Enter a positive number:-81

Square root of 81 is:-9

Enter the next number or enter 0 to quit:-4

Square root of 4 is:-2

Enter the next number or enter 0 to quit:-0

NOTE:- the above program prints the square root of given numbers using standard (built in) library function sqrt() present in <math.h> file, till the number entered is greater than 0. 

7.C++ Program to display:-

12345

1234

123

12

1

#include<iostream.h>

int main()

{

 int n=5,m=n,i,j;

  for(i=0;i<n;i++)

   { 

       for(j=1;j<=m;j++)

           {

              cout<<j;

            }

         cout<<endl;

          m--;

     }

  return 0;

}

Explanation:- In the above program second for loop is nested inside the first for loop.Each iteration of first for loop(i) will print one row and second for loop (j) iterates,from (1 to m) for each of the iteration of first for loop .Here newline and m decrement and decrement is given outside the second for loop and inside the first for loop so that output for each of the number is printed on a separate line.

8.C++ program to diplay:-

1

12

123

1234

12345

#include<iostream.h>

int main()

{

  int  n=5,m=1,i,j;

    for(i=0;i<n;i++)

       {

          for(j=1;j<=m;j++)

              {

                 cout<<j;

               }

          cout<<"\n";

          m++;

        }

     return 0;

}

Explanation:- In the above program for i=0 check i<n if true then for j=1 and check condition j<=m if true then print j then on next line again for i= 1 check i<n if true then for j=2 and so on and display the output

   

9.C++ program to generate Fibonacci series using while loop.

#include <iostream.h>

int main()

{

    int current=0,prev=0,prev2=1,fibnum;

    cout<<"Enter the number of Fibonacci numbers to compute = ";

    cin>>fibnum;

    cout<<”Fibonacci Series = ”;

    if(fibnum <=0)

          {

        cout<<"Error: Enter a positive number: ";

          }

    while(fibnum--)

          {

        cout<<prev ;

        current=prev + prev2;

        prev=prev2;

        prev2=current;

        if(fibnum)

            cout<<",";

          }

    cout<<endl;

    return 0;

}

/*************************Output**************************/

Enter the number of Fibonacci numbers to compute = 10

Fibonacci Series = 0,1,1,2,3,5,8,13,21,34

10.To write C++ program to decide the day of a week using switch-case.

#include <iostream.h>

void main()

{

          int day;

          cout<<”Enter number in the range of 1 to 7 to get corresponding day = ”;

          cin>>day;

          switch(day)

          {

                    case 1: cout<<”Today is Sunday”;

                              break;

case 2: cout<<”Today is Monday”;

                              break;

case 3: cout<<”Today is Tuesday”;

                              break;

case 4: cout<<”Today is Wednesday”;

                              break;

case 5: cout<<”Today is Thursday”;

                              break;

case 6: cout<<”Today is Friday”;

                              break;

case 7: cout<<”Today is Saturday”;

                              break;

default: cout<<”Not a valid day”;

                              break;

         }

}

/*************************Output**************************/

Enter number in the range of 1 to 7 to get corresponding day = 4

Today is Wednesday

11.C++ program to print the square root and raise to power of given numbers using standard (built in) library function.

#include <iostream.h>

#include<math.h>

void main()

{

          double number,x,y;

         cout<<"Enter a positive number = ";

         cin>>number;

              while(number>0)

                      {

                              cout<<"Square root of "<<number<<" is = "<<sqrt(number)<<endl;

                              cout<<"Enter the next number or enter 0 to quit = ";

                              cin>>number;

                      }

          cout<<"Enter the value of x = ";

          cin>>x;

          cout<<"Enter the value of y = ";

          cin>>y;

          cout<<x<<" raise to "<<y<<" is = "<<pow(x,y)<<endl;

}

/*************************Output**************************/

Enter a positive number = 64

Square root of 64 is = 8

Enter the next number or enter 0 to quit = 81

Square root of 81 is =9

Enter the next number or enter 0 to quit =0

Enter the value of x = 5

Enter the value of y = 4

5 raise to 4 is = 625

 

12.Write C++ program to calculate the area of circle and rectangle using overloaded function area.

double area(int);

int area(int,int);

#include<iostream.h>

void main()

{

          int r,l,b;

          double ac,ar;

          cout<<"Enter the value of  Length = ";

          cin>>l;

           cout<<"Enter the value of Breadth = ";

          cin>>b;

          ar=area(l,b);

          cout<<"Area of rectangle is = "<<ar<<endl;

          cout<<"Enter the value of radius =";

          cin>>r;

          ac=area(r);

          cout<<"Area of circle is = "<<ac;

}

double area(int r)

{       

    double area1;

          const double pi=3.14;

          area1=(pi*r*r);

          return area1;

}

int area(int l,int b)

{       

    int area2=l*b;

          return area2;

}

/*************************Output**************************/

Enter the value of Length = 3

Enter the value of Breadth = 5

Area of rectangle is = 15

Enter the value of radius = 3

Area of circle is = 28.26

13.C++ program to swap two numbers using functions.

#include<iostream.h>

void swap(int *,int *);

void main()

{

          int var1,var2,tmp;

          cout<<”Enter value of Variable 1:”;

          cin>>var1;

          cout<<”Enter value of Variable 2:”;

          cin>>var2;

          cout<<”Values of variables before Function Call:”;

          cout<<var1<<”/t”<<var2;

          swap(&var1,&var2);

          cout<<”\nValues of variables after Function Call:”;

}

void swap(int *a,int *b)

{

          int tmp;

          tmp=*a;

          *a=*b;

          *b=tmp;

}

/*************************Output**************************/

 Enter value of Variable1:3

Enter value of Variable2:4

Values of variable before Function Call: 3 4

Values of variable after Function Call: 4   3

14 .C++ program to count the words in text:-
#include<iostream.h>
#include<string.h>
void main()
{
    int i,len,w=0;
    char line[80];
    cout<<"Type your text:-";
    cout<<"\n";
    cin.getline(line,80);
    len=strlen(line);
    for(i=0;i<len;i++)
    {
        if(line[i]==' ')
            w++;
    }
    cout<<"Words in text typed by you are = "<<w+1;
    cout<<"\n";
}

Output:-
 Type your text:-
Welcome to the blog - Vijay Marwaha
Words in text typed by you are =7